The present disclosure describes a method of identifying serine hydrolase in a biological test sample obtained from protein production with a fluorophosphonate-containing probe. The present disclosure also provides a method of identifying one or more serine hydrolases in the biological test sample as causing PS-80 or PS-20 degradation.

The present disclosure relates to methods, cells, and compositions for producing a product of interest, e.g., a recombinant protein. In particular, the present disclosure provides improved mammalian cells expressing the product of interest, where the cells (e.g., Chinese Hamster Ovary (CHO) cells) have reduced or eliminated activity, e.g., expression, of certain host cell proteins, e.g., enzymes including, but not limited to, certain lipases, esterases, and/or hydrolases.

The present disclosure pertains to compositions with reduced presence of host-cell proteins and methods of making such compositions. In particular, it pertains to compositions methods of making compositions with reduced presence of host-cell proteins from a host-cell.

The present disclosure provides a DNA vaccine or immunogenic composition expressing consensus hemagglutinin-esterase-fusion (HEF) protein (FluD-Vax) and a protein-based vaccine utilizing the HEF consensus protein. Methods of making and using the compositions are also provided herein.

The present disclosure relates to methods, cells, and compositions for producing a product of interest, e.g., a recombinant protein. In particular, the present disclosure provides improved mammalian cells expressing the product of interest, where the cells (e.g., Chinese Hamster Ovary (CHO) cells) have reduced or eliminated activity, e.g., expression, of certain host cell proteins, e.g., enzymes including, but not limited to, certain lipases, esterases, and/or hydrolases.

The present disclosure relates to methods, cells, and compositions for producing a product of interest, e.g., a recombinant protein. In particular, the present disclosure provides improved mammalian cells expressing the product of interest, where the cells (e.g., Chinese Hamster Ovary (CHO) cells) have reduced or eliminated activity, e.g., expression, of certain host cell proteins, e.g., enzymes including, but not limited to, certain lipases, esterases, and/or hydrolases.